Hydrology and Water Resources Engineering Objective - Set 14 - ObjectiveBooks

# Practice Test: Question Set - 14

1. For computing the run off volumes of large areas, numbers of infiltrations used are
(A) 2
(B) 3
(C) 4
(D) 5

2. The efficiency of a pump may be taken as
(A) 0.55
(B) 0.60
(C) 0.65
(D) 0.70

3. The infiltration capacity during rain storm, is considerably reduced due to
(A) Surface detention
(B) Soil moisture
(C) Compaction due to rain
(D) All the above

4. The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of
(A) 0.1 h and 0.9 h
(B) 0.2 h and 0.8 h
(C) 0.3 h and 0.7 h
(D) 0.4 h and 0.6 h

5. A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges at 20 m and 40 m draw downs, is
(A) 2/3
(B) 5/4
(C) 4/5
(D) 8/7

6. A soil strata may consist of
(A) Soil zone
(B) Intermediate zone
(C) Capillary zone
(D) All the above

7. A river is said to be of uniform section if in its section
(A) A segment of a circle can be fitted
(B) A parabolic section can be fitted
(C) A rectangular section can be fitted
(D) All the above

8. Isopiestic lines are the contours
(A) Drawn to represent water table
(B) Drawn to represent piezometric heads
(C) Drawn to piezometric surface
(D) None of these

9. Pick up the correct statement from the following:
(A) When rainfall rate exceeds the infiltration capacity, the water enters the soil at full capacity rate
(B) When rainfall rate is less than the infiltration capacity, the infiltration rate is approximately equal to the rainfall rate
(C) The actual infiltration rate at any time may be equal to or less than the infiltration capacity
(D) All the above

10. While calculating the average depth of annual precipitation in a catchment basin, importance to individual rain-gauge station is given in
(A) Arithmetical method
(B) Thiessen's mean method
(C) Isohyetal method
(D) Both (b) and (c)

11. If the viscosity of ground water is 1.00, the Slitcher's constant is 400, the effective size of soil particles in aquifer is 0.5 mm and hydraulic gradient is 1 in 80, the velocity of flow is
(A) 0.25 m/day
(B) 0.50 m/day
(C) 1.00 m/day
(D) 1.25 m/day

12. Pick up the correct statement from the following:
(A) Index of wetness = actual rainfall in a year at a place/normal rainfall of that place
(B) Normal annual rainfall is obtained by taking the mean of the annual rainfall over a period of 35 years
(C) Index of wetness gives an idea of the wetness of the year
(D) All the above

13. If total run off of a basin of 50 hectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where Q is the discharge in cumecs at the given time)
(A) y = 50 Q
(B) y = 100 Q
(C) y = 200 Q
(D) y = 250 Q

14. Water is useful for
(A) Running hydroelectric turbines
(B) Floating the boats and ships
(C) Providing steam for running locomotives
(D) All the above

15. The recurrence interval (R.I.) of 20 cm rain storm at a place is 5 years.
(A) The place will definitely have 20 cm rain storm after every five years
(B) The place may have 20 cm rain storm after every five years
(C) The place may have 20 cm rain storm within a set of 5 years twice
(D) None of these

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